LICENSE: Reformat for Github

Should be equivalent to the license before, but compatible with the library Github uses to detect the license for the project's metadata: https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/licensing-a-repository#detecting-a-license

Signed-off-by: Andrey Petrov <andrey.petrov@shazow.net>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f